WAEC Mathematics 2020 Objective — Question 4
Question 4 of 50 from the West African Examinations Council (WAEC) Mathematics 2020 Objective paper, with the correct answer and a full explanation.
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Find the least value of x which satisfies the equation 4x = 7 (mod 9).
- A. 7
- B. 6
- C. 5
- D. 4Correct
Explanation
4x = 7 (mod 9). Adding 9 repeatedly to 7 to find a value divisible by 4: 7+9=16, so 4x=16, giving x=4.
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